3

Float

  1. #include <iostream>
  2.  
  3. #include <float.h>
  4.  
  5. int main() {
  6.     using namespace std;
  7.  
  8.     const int NBITS = 8;    // bits in a byte
  9.  
  10.     int fbits = sizeof (float) * NBITS; // bits in a float
  11.  
  12.     cout << "\n A float takes:\t" << fbits << " bits:\n\t\t";
  13.     cout << FLT_MANT_DIG - 1 << " bits for the mantissa\n\t\t ";
  14.     cout << fbits - FLT_MANT_DIG << " bits for the exponent\n\t\t ";
  15.     cout << 1 << " bit for the sign\n";
  16.     cout << " with " << FLT_DIG << " significant digits\n";
  17.     cout << " min value is " << FLT_MIN << endl;
  18.     cout << " max value is " << FLT_MAX << endl;
  19. }

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